Francesco Padormo1, Shaihan J. Malik1, Jo V. Hajnal1
1Imaging Sciences Department, MRC Clinical Sciences Centre, Hammersmith Hospital, Imperial College, London, United Kingdom
We present a method of obtaining relative multi-channel B1+ information directly from k-space measurements. This approach, which is based on ideas from the SPIRIT technique, is fast, low in SAR and produces maps free of anatomy and noise. The method can also extract full receive coil profiles form the same data. We demonstrate that this technique is capable of full 3D calibration of a whole body 8 channel transmit RF system in 14s plus the time to acquire a single channel B1+ map. Up to 8 receiver channels can be calibrated using the same processing with no further data acquisition.